u/Curious-Barnacle-781

Sharing RegCalc - handles baud, timer, PWM, ADC, bus clocks with an ESP32 profile (240 MHz defaults, tweakable).

Free, no signup. I use it instead of re-deriving divisors on every project.

Happy to add ESP32-S3 / C3 specific defaults if you have a preferred board config.

▲ 1 r/stm32+1 crossposts

Built RegCalc for quick STM32 bring-up math:

- APB PCLK → UART BRR (16×/8× OS)

- PLL M/N/P/Q with SYSCLK + USB 48 MHz check

- TIM prescaler/auto-reload for interrupt frequency

- PWM / ADC / I²C timing

STM32F4 & H7 profiles included. Runs in browser:

Free tier is complete; PRO exports HAL snippets if useful.

Let me know if something's off for your clock setup.